Model issue

as said in the tittle, i have a strange thing with a ship model:

- shiparch.ini OK
- goods.ini OK

BUT... when i undock, the ship burns (???), but no damages, i thought it was the harpoints which was the cause and have edited some with HardCMP, so, less burn "points" (don't know how to say it, sorry), just one in the middle, i spend a few hours to check all files, have compared with other models if i've not forget something, found nothing wrong, any idea?